axmol/extensions/Particle3D/PU/CCPUCircleEmitter.cpp

/****************************************************************************
 Copyright (C) 2013 Henry van Merode. All rights reserved.
 Copyright (c) 2015-2016 Chukong Technologies Inc.
 Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.
 
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 of this software and associated documentation files (the "Software"), to deal
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 The above copyright notice and this permission notice shall be included in
 all copies or substantial portions of the Software.
 
 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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#include "CCPUCircleEmitter.h"
#include "extensions/Particle3D/PU/CCPUParticleSystem3D.h"
#include "extensions/Particle3D/PU/CCPUUtil.h"
#include "base/ccRandom.h"

NS_CC_BEGIN

// Constants
const float PUCircleEmitter::DEFAULT_RADIUS = 100.0f;
const float PUCircleEmitter::DEFAULT_STEP = 0.1f;
const float PUCircleEmitter::DEFAULT_ANGLE = 0.0f;
const bool PUCircleEmitter::DEFAULT_RANDOM = true;
const Vec3 PUCircleEmitter::DEFAULT_NORMAL(0, 0, 0);

//-----------------------------------------------------------------------
PUCircleEmitter::PUCircleEmitter(void) : 
    PUEmitter(),
    _radius(DEFAULT_RADIUS),
    _circleAngle(DEFAULT_ANGLE),
    _originalCircleAngle(DEFAULT_ANGLE),
    _step(DEFAULT_STEP),    
    _x(0.0f),
    _z(0.0f),
    _random(DEFAULT_RANDOM),
    _orientation(),
    _normal(DEFAULT_NORMAL)
{
}
//-----------------------------------------------------------------------
float PUCircleEmitter::getRadius() const
{
    return _radius;
}
//-----------------------------------------------------------------------
void PUCircleEmitter::setRadius(const float radius)
{
    _radius = radius;
}
//-----------------------------------------------------------------------
float PUCircleEmitter::getCircleAngle() const
{
    return _originalCircleAngle;
}
//-----------------------------------------------------------------------
void PUCircleEmitter::setCircleAngle(const float circleAngle)
{
    _originalCircleAngle = circleAngle;
    _circleAngle = circleAngle;
}
//-----------------------------------------------------------------------
float PUCircleEmitter::getStep() const
{
    return _step;
}
//-----------------------------------------------------------------------
void PUCircleEmitter::setStep(const float step)
{
    _step = step;
}
//-----------------------------------------------------------------------
bool PUCircleEmitter::isRandom() const
{
    return _random;
}
//-----------------------------------------------------------------------
void PUCircleEmitter::setRandom(const bool random)
{
    _random = random;
}
//-----------------------------------------------------------------------
const Quaternion& PUCircleEmitter::getOrientation(void) const
{
    return _orientation;
}
//----------------------------------------------------------------------- 
const Vec3& PUCircleEmitter::getNormal(void) const
{ 
    return _normal;
} 
//----------------------------------------------------------------------- 
void PUCircleEmitter::setNormal(const Vec3& normal) 
{ 
    //_orientation = Vec3::UNIT_Y.getRotationTo(normal, Vec3::UNIT_X);
    _orientation = getRotationTo(Vec3::UNIT_Y, normal, Vec3::UNIT_X);
    _normal = normal;
}
//-----------------------------------------------------------------------
void PUCircleEmitter::notifyStart (void)
{
    // Reset the attributes to allow a restart.
    _circleAngle = _originalCircleAngle;
}
//----------------------------------------------------------------------- 
void PUCircleEmitter::initParticlePosition(PUParticle3D* particle)
{
    float angle = 0;
    if (_random)
    {
        // Choose a random position on the circle.
        angle = cocos2d::random(0.0, M_PI * 2.0);
    }
    else
    {
        // Follow the contour of the circle.
        _circleAngle += _step;
        _circleAngle = _circleAngle > M_PI * 2.0f ? _circleAngle - (M_PI * 2.0) : _circleAngle;
        angle = _circleAngle;
    }

    _x = cosf(angle);
    _z = sinf(angle);
    //ParticleSystem* sys = mParentTechnique->getParentSystem();
    //if (sys)
    {
        // Take both orientation of the node and its own orientation, based on the normal, into account
        Mat4 rotMat;
        Mat4::createRotation(static_cast<PUParticleSystem3D *>(_particleSystem)->getDerivedOrientation() * _orientation, &rotMat);
        particle->position = getDerivedPosition() + 
            /*sys->getDerivedOrientation() * */rotMat * (Vec3(_x * _radius * _emitterScale.x, 0, _z * _radius * _emitterScale.z));
    }
    //else
    //{
    //	particle->position = getDerivedPosition() + _emitterScale * ( mOrientation * Vec3(mX * mRadius, 0, mZ * mRadius) );
    //}
    particle->originalPosition = particle->position;
}
//-----------------------------------------------------------------------
void PUCircleEmitter::initParticleDirection(PUParticle3D* particle)
{
    if (_autoDirection)
    {
        // The value of the direction vector that has been set does not have a meaning for
        // the circle emitter.
        float angle = 0.0f;
        generateAngle(angle);
        if (angle != 0.0f)
        {
            //particle->direction = (mOrientation * Vec3(mX, 0, mZ) ).randomDeviant(angle, mUpVector);
            Mat4 mat;
            Mat4::createRotation(_orientation, &mat);
            Vec3 temp = mat * Vec3(_x, 0, _z);

            particle->direction = PUUtil::randomDeviant(temp, angle, _upVector);

            particle->originalDirection = particle->direction;
        }
        else
        {
            Mat4 rotMat;
            Mat4::createRotation(_orientation, &rotMat);
            particle->direction = rotMat * Vec3(_x, 0, _z);
        }
    }
    else
    {
        // Use the standard way
        PUEmitter::initParticleDirection(particle);
    }
}

PUCircleEmitter* PUCircleEmitter::create()
{
    auto pe = new (std::nothrow) PUCircleEmitter();
    pe->autorelease();
    return pe;
}

cocos2d::Quaternion PUCircleEmitter::getRotationTo( const Vec3 &src, const Vec3& dest, const Vec3& fallbackAxis /*= Vec3::ZERO*/ ) const
{
    // Based on Stan Melax's article in Game Programming Gems
    Quaternion q;
    // Copy, since cannot modify local
    Vec3 v0 = src;
    Vec3 v1 = dest;
    v0.normalize();
    v1.normalize();

    float d = v0.dot(v1);
    // If dot == 1, vectors are the same
    if (d >= 1.0f)
    {
        return Quaternion();
    }
    if (d < (1e-6f - 1.0f))
    {
        if (fallbackAxis != Vec3::ZERO)
        {
            // rotate 180 degrees about the fallback axis
            q.set(fallbackAxis, (float)M_PI);
            //q.FromAngleAxis(Radian(Math::PI), fallbackAxis);
        }
        else
        {
            // Generate an axis
            Vec3 axis/* = Vec3::UNIT_X.crossProduct(*this)*/;
            Vec3::cross(Vec3::UNIT_X, src, &axis);
            if (axis.lengthSquared() < (1e-06 * 1e-06)) // pick another if colinear
                //axis = Vec3::UNIT_Y.crossProduct(*this);
                Vec3::cross(Vec3::UNIT_Y, src, &axis);
            axis.normalize();

            //q.FromAngleAxis(Radian(Math::PI), axis);
            q.set(axis, (float)M_PI);
        }
    }
    else
    {
        /*float s = Math::Sqrt( (1+d)*2 );*/
        float s = sqrtf( (1+d)*2 );
        float invs = 1 / s;

        Vec3 c /*= v0.crossProduct(v1)*/;
        Vec3::cross(v0, v1, &c);

        q.x = c.x * invs;
        q.y = c.y * invs;
        q.z = c.z * invs;
        q.w = s * 0.5f;
        q.normalize();
    }
    return q;
}

void PUCircleEmitter::copyAttributesTo( PUEmitter* emitter )
{
    PUEmitter::copyAttributesTo(emitter);

    PUCircleEmitter* circleEmitter = static_cast<PUCircleEmitter*>(emitter);
    circleEmitter->_radius = _radius;
    circleEmitter->_circleAngle = _circleAngle;
    circleEmitter->_originalCircleAngle = _originalCircleAngle;
    circleEmitter->_step = _step;
    circleEmitter->_random = _random;
    circleEmitter->_normal = _normal;
    circleEmitter->_orientation = _orientation; 
}

PUCircleEmitter* PUCircleEmitter::clone()
{
    auto be = PUCircleEmitter::create();
    copyAttributesTo(be);
    return be;
}

NS_CC_END